body{
    background-color: rgb(255, 255, 255);
}
div{
    overflow: hidden;
}
.cl{
    clear: both;
}
.wrapper{
    width: 1000px;
    background-color: #fff222;
    margin: 0 auto;  /*水平居中 */
}
.header{
    width: 990px;
    background-color: #9291ff;
    margin: 0 auto;
    min-height: 200px;
}

.main{
    width: 990px;
    background-color: #ffffff;
    margin: 0 auto;
}

.footer{
    width: 990px;
    background-color: #91ffde;
    margin: 0 auto;
    min-height: 100px;
}

.sidebar{
    float: left;
    width: 200px;
    height: 600px;
    background-color: #ff77bb;
}
.content{
    float: left;
    width: 790px;
    min-height: 600px;
    background-color: #15ffff;
}